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5
Inspection of the leveling accuracy of the
laser level
Check the leveling accuracy of the unit (laser level)
periodically in the following manners:
Fig. 7
1. Check the leveling accuracy of horizontal
laser-beam line.
1) Place the unit on the floor of an indoor corner
at the point of 3 to 5 m from the one wall and
1 m from the another one. (See the Fig.7)
Turn the level adjusting ring (9 ) so that the
air-bubble in the round vial (4) is centered.
2) Turn on the power switch (12).
3) Turn the unit and mark both ends of laser line
projected on the both walls.
4) Then turn the unit on both sides. Make sure
that half of the deviation from laser line to the
first marked point is within the leveling
accuracy specified.
2. Check the leveling accuracy of vertical
laser-beam line.
Fig. 8
1) Hang a plumb-bob (See the figure 8) from 3
m height of the wall (the height of ceiling is
approx. 3 m).
Place the unit on the floor at the point of 2 to
5 m away from the wall. Make sure that the
air-bubble is centered in the round vial (4).
2) Turn on the power switch 12. Then press the
V button.
3) Direct the vertical laser line to the string of
plumb-bob. Then adjust the vertical laser line
to the lower end of the string. Make sure that
deviation from the vertical laser line to the
upper end of the string is within the leveling
accuracy specified.